NEET Physics / AI question bank / NCERT Class 12 / Electromagnetic Waves
Electromagnetic Waves: NEET questions with solutions
NEET tests the displacement current ε₀ dΦ_E/dt, the relations B₀ = E₀/c and c = 1/√(μ₀ε₀), reading wavelength, frequency and direction from a wave equation, the mutual perpendicularity of E, B and travel, and the order of the spectrum with the source and use of each band. Marks are lost by mixing up neighbouring bands, by setting B₀ equal to E₀, and by forgetting that every em wave has the same speed in vacuum.
Also called: EM waves · electromagnetic spectrum · displacement current
Questions
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- Q1In a plane electromagnetic wave travelling in vacuum, the electric field oscillates with amplitude 120 V m⁻¹. What are the amplitude of the…
Nature of electromagnetic wavesEasySingle correct
- Q2Which sequence lists these radiations in order of increasing wavelength?
The electromagnetic spectrumEasySingle correct
- Q3While a parallel plate capacitor with plates of area 0.040 m² is being charged, the electric field between the plates increases at a rate of…
Displacement currentMediumSingle correct
- Q4The electric field of an em wave in vacuum is E_y = E₀ sin(kx − ωt), with ω = 6.0 × 10⁹ rad s⁻¹. What is its wavelength? (c = 3.0 × 10⁸ m…
Speed in vacuum and in mediaMediumSingle correct
- Q5A plane em wave travels in the +z direction. At a certain point and instant, its electric field points along +x. Along which direction does…
Nature of electromagnetic wavesEasySingle correct
- Q6Match each band of the electromagnetic spectrum in List I with a matching fact about it in List II.
The electromagnetic spectrumMediumMatch the following
- Q7Four claims are made about how electromagnetic waves are produced and how they travel. Which of them hold?
Sources of electromagnetic wavesMediumStatement based
- Q8A 100 MHz em wave passes from vacuum into a non-magnetic medium (μᵣ = 1) of relative permittivity εᵣ = 2.25. What is its wavelength in the…
Speed in vacuum and in mediaHardSingle correct
- Q9A parallel plate capacitor is being charged by a steady current. Read the Assertion (A) and Reason (R) and choose the correct option.
The charging capacitor puzzleMediumAssertion–Reason
- Q10The magnetic field of an em wave in vacuum is B_z = (4.0 × 10⁻⁸ T) sin(1000x + 3.0 × 10¹¹ t), with x in metres and t in seconds. In which…
Nature of electromagnetic wavesHardSingle correct
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